The NHS's 1.2 million employees are trapped in a 'reply-all' email hell

A reply-all email thread is like a very loud, very annoying megaphone. Do not shout into it.
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The NHS's 1.2 million employees are currently trapped in a "reply-all" email hell.

A "test" email was accidentally sent to everyone who works at the UK health service — prompting a series of reply-all responses from annoyed recipients going out to all 1-million-plus employees of the organisations.

An NHS employee told Business Insider that there have been at least 120 replies so far — meaning that more than 140 million needless emails have been sent across the NHS's network today. As a result, they said, its email systems are running "very slow today."